If you mean "special" just type in goblin in the search box on the main site. If you mean the other special, well I'll just let the others answer this.
Not sure if that's something you're looking for The Last Angle (AI of a super Dreadnaught on a revenge trip) Edit : Lament of the Fallen (some super hybrid of several species) The void Wolf (Titel says it already) Maou Shoujo Makoto Chaos
Non-Human Protag Tag No Harem http://www.novelupdates.com/series-finder/?sf=1&ge=3&tgi=3388&mtgi=or&sort=abc&order=asc
Demon Girl ~Tale of a Lax Demon~ - Rare Devil I Reincarnated Into a Vending Machine - A vending machine Kumo Desu ga, Nani ka? - Evolves into a special species Paradise of Demonic Gods - I think they are part demonic god
http://royalroadl.com/fiction/8894/everybody-loves-large-chests (box mc) http://royalroadl.com/fiction/10211/necro-tourists-the-undead-living-the-life (op arch-lich) http://royalroadl.com/fiction/4293/the-iron-teeth-a-goblins-tale http://royalroadl.com/fiction/5589/the-fiasco (his ability is too unique) http://royalroadl.com/fiction/3063/rehamster http://royalroadl.com/fiction/1014/reocean (evolving squid) http://royalroadl.com/fiction/10775/requiem-of-souls (his race changes early in the story) http://www.novelupdates.com/series/tensei-shitara-slime-datta-ken/ http://www.novelupdates.com/series/dungeon-hunter/ http://www.novelupdates.com/series/remonster/ https://www.goodreads.com/series/111011-demon-lord https://www.goodreads.com/series/92537-the-tome-of-bill
Everybody Loves Large Chests ( Mimic ) The Spearmaster and the Black Cat ( Vampire without any weakness )